/******************************************************************************\
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This sample was distributed or derived from the Intel's Media Samples package.
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\**********************************************************************************/

// Copyright (C) <2020> Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0

#ifndef OWT_BASE_LINUX_BASEALLOCATOR_H_
#define OWT_BASE_LINUX_BASEALLOCATOR_H_

#include <string.h>
#include <functional>
#include <list>
#include <memory>
#include "mfx/mfxvideo.h"


struct mfxAllocatorParams {
  virtual ~mfxAllocatorParams(){};
};

// this class implements methods declared in mfxFrameAllocator structure
// simply redirecting them to virtual methods which should be overridden in
// derived classes
class MFXFrameAllocator : public mfxFrameAllocator {
 public:
  MFXFrameAllocator();
  virtual ~MFXFrameAllocator();

  // optional method, override if need to pass some parameters to allocator from
  // application
  virtual mfxStatus Init(mfxAllocatorParams* pParams) = 0;
  virtual mfxStatus Close() = 0;

  virtual mfxStatus AllocFrames(mfxFrameAllocRequest* request,
                                mfxFrameAllocResponse* response) = 0;
  virtual mfxStatus LockFrame(mfxMemId mid, mfxFrameData* ptr) = 0;
  virtual mfxStatus UnlockFrame(mfxMemId mid, mfxFrameData* ptr) = 0;
  virtual mfxStatus GetFrameHDL(mfxMemId mid, mfxHDL* handle) = 0;
  virtual mfxStatus FreeFrames(mfxFrameAllocResponse* response) = 0;

 private:
  static mfxStatus MFX_CDECL Alloc_(mfxHDL pthis,
                                    mfxFrameAllocRequest* request,
                                    mfxFrameAllocResponse* response);
  static mfxStatus MFX_CDECL Lock_(mfxHDL pthis,
                                   mfxMemId mid,
                                   mfxFrameData* ptr);
  static mfxStatus MFX_CDECL Unlock_(mfxHDL pthis,
                                     mfxMemId mid,
                                     mfxFrameData* ptr);
  static mfxStatus MFX_CDECL GetHDL_(mfxHDL pthis,
                                     mfxMemId mid,
                                     mfxHDL* handle);
  static mfxStatus MFX_CDECL Free_(mfxHDL pthis,
                                   mfxFrameAllocResponse* response);
};

// This class implements basic logic of memory allocator
// Manages responses for different components according to allocation request
// type External frames of a particular component-related type are allocated in
// one call Further calls return previously allocated response. Ex. Preallocated
// frame chain with type=FROM_ENCODE | FROM_VPPIN will be returned when request
// type contains either FROM_ENCODE or FROM_VPPIN

// This class does not allocate any actual memory
// class MSDKMutex;

class BaseFrameAllocator : public MFXFrameAllocator {
 public:
  BaseFrameAllocator();
  virtual ~BaseFrameAllocator();

  virtual mfxStatus Init(mfxAllocatorParams* pParams) = 0;
  virtual mfxStatus Close();
  virtual mfxStatus AllocFrames(mfxFrameAllocRequest* request,
                                mfxFrameAllocResponse* response);
  virtual mfxStatus FreeFrames(mfxFrameAllocResponse* response);

 protected:
  // std::unique_ptr<MSDKMutex> mtx;
  typedef std::list<mfxFrameAllocResponse>::iterator Iter;
  static const mfxU32 MEMTYPE_FROM_MASK =
      MFX_MEMTYPE_FROM_ENCODE | MFX_MEMTYPE_FROM_DECODE |
      MFX_MEMTYPE_FROM_VPPIN | MFX_MEMTYPE_FROM_VPPOUT | MFX_MEMTYPE_FROM_ENC |
      MFX_MEMTYPE_FROM_PAK;

  static const mfxU32 MEMTYPE_FROM_MASK_INT_EXT = MEMTYPE_FROM_MASK |
                                                  MFX_MEMTYPE_INTERNAL_FRAME |
                                                  MFX_MEMTYPE_EXTERNAL_FRAME;

  struct UniqueResponse : mfxFrameAllocResponse {
    mfxU16 m_width;
    mfxU16 m_height;
    mfxU32 m_refCount;
    mfxU16 m_type;

    UniqueResponse() : m_width(0), m_height(0), m_refCount(0), m_type(0) {
      memset(static_cast<mfxFrameAllocResponse*>(this), 0,
             sizeof(mfxFrameAllocResponse));
    }

    // compare responses by actual frame size, alignment (w and h) is up to
    // application
    UniqueResponse(const mfxFrameAllocResponse& response,
                   mfxU16 width,
                   mfxU16 height,
                   mfxU16 type)
        : mfxFrameAllocResponse(response),
          m_width(width),
          m_height(height),
          m_refCount(1),
          m_type(type) {}

    // compare by resolution (and memory type for FEI ENC / PAK)
    bool operator()(const UniqueResponse& response) const {
      if (m_width <= response.m_width && m_height <= response.m_height) {
        // For FEI ENC and PAK we need to distinguish between INTERNAL and
        // EXTERNAL frames

        if (m_type & response.m_type &
            (MFX_MEMTYPE_FROM_ENC | MFX_MEMTYPE_FROM_PAK)) {
          return !!((m_type & response.m_type) & 0x000f);
        } else {
          return !!(m_type & response.m_type & MFX_MEMTYPE_FROM_DECODE);
        }
      } else {
        return false;
      }
    }

    static mfxU16 CropMemoryTypeToStore(mfxU16 type) {
      // Remain INTERNAL / EXTERNAL flag for FEI ENC / PAK
      switch (type & 0xf000) {
        case MFX_MEMTYPE_FROM_ENC:
        case MFX_MEMTYPE_FROM_PAK:
        case (MFX_MEMTYPE_FROM_ENC | MFX_MEMTYPE_FROM_PAK):
          return type & MEMTYPE_FROM_MASK_INT_EXT;
          break;
        default:
          return type & MEMTYPE_FROM_MASK;
          break;
      }
    }
  };

  std::list<mfxFrameAllocResponse> m_responses;
  std::list<UniqueResponse> m_ExtResponses;

  struct IsSame : public std::binary_function<mfxFrameAllocResponse,
                                              mfxFrameAllocResponse,
                                              bool> {
    bool operator()(const mfxFrameAllocResponse& l,
                    const mfxFrameAllocResponse& r) const {
      return r.mids != 0 && l.mids != 0 && r.mids[0] == l.mids[0] &&
             r.NumFrameActual == l.NumFrameActual;
    }
  };

  // checks if request is supported
  virtual mfxStatus CheckRequestType(mfxFrameAllocRequest* request);

  // frees memory attached to response
  virtual mfxStatus ReleaseResponse(mfxFrameAllocResponse* response) = 0;
  // allocates memory
  virtual mfxStatus AllocImpl(mfxFrameAllocRequest* request,
                              mfxFrameAllocResponse* response) = 0;

  template <class T>
  class safe_array {
   public:
    safe_array(T* ptr = 0)
        : m_ptr(ptr){
              // construct from object pointer
          };
    ~safe_array() { reset(0); }
    T* get() {  // return wrapped pointer
      return m_ptr;
    }
    T* release() {  // return wrapped pointer and give up ownership
      T* ptr = m_ptr;
      m_ptr = 0;
      return ptr;
    }
    void reset(T* ptr) {  // destroy designated object and store new pointer
      if (m_ptr) {
        delete[] m_ptr;
      }
      m_ptr = ptr;
    }

   protected:
    T* m_ptr;  // the wrapped object pointer
   private:
    safe_array(const safe_array&);
    safe_array& operator=(const safe_array&);
  };
};

class MFXBufferAllocator : public mfxBufferAllocator {
 public:
  MFXBufferAllocator();
  virtual ~MFXBufferAllocator();

  virtual mfxStatus AllocBuffer(mfxU32 nbytes, mfxU16 type, mfxMemId* mid) = 0;
  virtual mfxStatus LockBuffer(mfxMemId mid, mfxU8** ptr) = 0;
  virtual mfxStatus UnlockBuffer(mfxMemId mid) = 0;
  virtual mfxStatus FreeBuffer(mfxMemId mid) = 0;

 private:
  static mfxStatus MFX_CDECL Alloc_(mfxHDL pthis,
                                    mfxU32 nbytes,
                                    mfxU16 type,
                                    mfxMemId* mid);
  static mfxStatus MFX_CDECL Lock_(mfxHDL pthis, mfxMemId mid, mfxU8** ptr);
  static mfxStatus MFX_CDECL Unlock_(mfxHDL pthis, mfxMemId mid);
  static mfxStatus MFX_CDECL Free_(mfxHDL pthis, mfxMemId mid);
};

#endif  // OWT_BASE_LINUX_BASEALLOCATOR_H_
